package org.hsqldb.persist;

import java.io.IOException;

import org.hsqldb.HsqlException;
import org.hsqldb.Row;
import org.hsqldb.RowAVL;
import org.hsqldb.RowAVLDisk;
import org.hsqldb.RowAction;
import org.hsqldb.RowLinkList;
import org.hsqldb.Session;
import org.hsqldb.Table;
import org.hsqldb.TransactionManager;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.NodeAVLDisk;
import org.hsqldb.index.NodeLinkListDisk;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.rowio.RowInputInterface;

public class RowStoreLinkListDisk extends RowStoreLinkList {

	RowLinkList currentRow;
	public RowStoreLinkListDisk(PersistentStoreCollection manager,
			Table table) {
		super(manager, null, table);
	}
	public RowStoreLinkListDisk(PersistentStoreCollection collection,
			DataFileCache cache, Table table) {
		this.database     = table.database;
        this.manager      = collection;
        this.table        = table;
        this.indexList    = table.getIndexList();
        this.accessorList = new CachedObject[indexList.length];
        this.cache        = cache;

        if (cache != null) {
            rowOut = cache.rowOut.duplicate();

            cache.adjustStoreCount(1);
        }

        manager.setStore(table, this);
	}
	
	public boolean isMemory() {
        return false;
    }

    public int getAccessCount() {
        return cache.getAccessCount();
    }

    public void set(CachedObject object) {

        Row row = ((Row) object);

        database.txManager.setTransactionInfo(row);
    }

    public CachedObject get(int key) {

        CachedObject object = cache.get(key, this, false);

        return object;
    }

    public CachedObject get(int key, boolean keep) {

        CachedObject object = cache.get(key, this, keep);

        return object;
    }

    public CachedObject get(CachedObject object, boolean keep) {

        object = cache.get(object, this, keep);

        return object;
    }

    public int getStorageSize(int i) {
        return cache.get(i, this, false).getStorageSize();
    }

    public void add(CachedObject object) {

    	int size = object.getRealSize(rowOut);

        size += indexList.length * NodeLinkListDisk.SIZE_IN_BYTE;
        size = rowOut.getStorageSize(size);

        object.setStorageSize(size);
        cache.add(object);
    }

    public CachedObject get(RowInputInterface in) {

    	try {
            return new RowLinkList(table, in);
        } catch (IOException e) {
            throw Error.error(ErrorCode.DATA_FILE_ERROR, e);
        }
    }

    public CachedObject getNewCachedObject(Session session, Object object,
                                           boolean tx) {

    	Row row = new RowLinkList(table, (Object[]) object, this);
        add(row);
        if (tx) {
            RowAction action = new RowAction(session, table,
                                             RowAction.ACTION_INSERT, row,
                                             null);

            row.rowAction = action;
        }
        return row;
    }

    public void indexRow(Session session, Row row) {
    	 try {
             super.indexRow(session, row);
         } catch (HsqlException e) {
             database.txManager.removeTransactionInfo(row);

             throw e;
         }
    }


    public void removeAll() {

        elementCount = 0;

        ArrayUtil.fillArray(accessorList, null);
    }

    public void remove(int i) {
        cache.remove(i, this);
    }

    public void removePersistence(int i) {
        cache.removePersistence(i, this);
    }

    public void release(int i) {
        cache.release(i);
    }

    public CachedObject getAccessor(Index key) {

        int position = key.getPosition();

        if (position >= accessorList.length) {
            throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
        }

        return accessorList[position];
    }

    public void commitPersistence(CachedObject row) {

        
    }

    public void commitRow(Session session, Row row, int changeAction,
                          int txModel) {

    	Object[] data = row.getData();

        switch (changeAction) {

            case RowAction.ACTION_DELETE :
                database.logger.writeDeleteStatement(session, (Table) table,
                                                     data);

                if (txModel == TransactionManager.LOCKS) {
                    remove(row.getPos());
                }
                break;

            case RowAction.ACTION_INSERT :
                database.logger.writeInsertStatement(session, row,
                                                     (Table) table);
                break;

            case RowAction.ACTION_INSERT_DELETE :

                // INSERT + DELETE
                if (txModel == TransactionManager.LOCKS) {
                    remove(row.getPos());
                }
                break;

            case RowAction.ACTION_DELETE_FINAL :
                delete(session, row);

                // remove info after delete
                database.txManager.removeTransactionInfo(row);
                remove(row.getPos());
                break;
        }
    }

    public void rollbackRow(Session session, Row row, int changeAction,
                            int txModel) {

    	switch (changeAction) {

	        case RowAction.ACTION_DELETE :
	            if (txModel == TransactionManager.LOCKS) {
	                row = (Row) get(row, true);
	
	                ((RowAVL) row).setNewNodes(this);
	                row.keepInMemory(false);
	                indexRow(session, row);
	            }
	            break;
	
	        case RowAction.ACTION_INSERT :
	            if (txModel == TransactionManager.LOCKS) {
	                delete(session, row);
	                remove(row.getPos());
	            }
	            break;
	
	        case RowAction.ACTION_INSERT_DELETE :
	
	            // INSERT + DELETE
	            if (txModel == TransactionManager.LOCKS) {
	                remove(row.getPos());
	            }
	            break;
	    }
    }
    public DataFileCache getCache() {
        return cache;
    }

    public void setCache(DataFileCache cache) {
        this.cache = cache;
    }
    
    public void release() {

    	ArrayUtil.fillArray(accessorList, null);
        cache.adjustStoreCount(-1);

        cache = null;
    }
}
